@article{GDZPPN00225266X, title = {Classification der algebraischen Stahlensysteme}, journal = {Mathematische Annalen}, volume = {35}, year = {1890}, pages = {100-140}, zbl = {22.0818.01}, url = {http://dml.mathdoc.fr/item/GDZPPN00225266X} }
Schumacher. Classification der algebraischen Stahlensysteme. Mathematische Annalen, Tome 35 (1890) pp. 100-140. http://gdmltest.u-ga.fr/item/GDZPPN00225266X/